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Search: id:A122760
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| A122760 |
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Triangle read by rows: t(n,m) = 2*3^m*(n mod 2). |
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+0
1
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| 0, 2, 6, 0, 0, 0, 2, 6, 18, 54, 0, 0, 0, 0, 0, 2, 6, 18, 54, 162, 486, 0, 0, 0, 0, 0, 0, 0, 2, 6, 18, 54, 162, 486, 1458, 4374, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 6, 18, 54, 162, 486, 1458, 4374, 13122, 39366, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
(list; table; graph; listen)
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OFFSET
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1,2
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COMMENT
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A Cantor-based power of 3 triangular array.
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REFERENCES
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Lynn Arthur Steen and J. Arthur Seebach, Jr., Counterexamples in Topology, Dover, New York, 1978, 57-58
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EXAMPLE
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0
2, 6
0, 0, 0
2, 6, 18, 54
0, 0, 0, 0, 0
2, 6, 18, 54, 162, 486
0, 0, 0, 0, 0, 0, 0
2, 6, 18, 54, 162, 486, 1458, 4374
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MATHEMATICA
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b[n_] := 2*Mod[n, 2] T2[n_, m_] := 3^n*b[m] b0 = Table[Table[T2[n, m], {n, 0, m}], {m, 0, 10}]; Flatten[b0] MatrixForm[b0]
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CROSSREFS
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Row sums: see A024101.
Sequence in context: A057678 A090071 A139062 this_sequence A165733 A039907 A072340
Adjacent sequences: A122757 A122758 A122759 this_sequence A122761 A122762 A122763
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KEYWORD
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nonn,tabl
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AUTHOR
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Roger Bagula (rlbagulatftn(AT)yahoo.com), Sep 21 2006
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EXTENSIONS
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Edited and corrected by N. J. A. Sloane, May 29 2009
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